/Engine/Plugins/Media/ElectraCodecs/Source/ElectraDecoders/Public/IElectraDecoderOutputAudio.h
If samples are interleaved they appear in memory alternatingly per channel. Eg. L,R,L,R,L,R,... If they are not interleaved there will be separate buffers containing samples of a single channel each.
bool IsInterleaved() const